Heating apparatus



Fame 24 1936 I H. R. HUMPHREY m AL 1,766,076

HEATING APPARATUS g Filed Jan. 23, 1929 2 Sheets-Sheet 2 IN VEN TOR Nu bar! IE Humphrey 5y 45076 1:? I w ATTOR 3 Patented June 24, 1930 UNITED STATES PATENT OFFICE HUBER! R. HUMPHREY AND GEORGE A. HUMPHREY, 0F KALAMAZOO, MICHIGAN, ASSIGNORS TO GENERAL GAS LIGHTCOMPANY, OF KALAMAZOO, MICHIGAN nnarmo APPARATUS Our present improvements are especially designed by us for embodiment in heatin apparatus of the character illustrated an described in our application for Letters Patent filed November 3, 1928, Serial No. 314,- 017, and we have illustrated the same as embodied in such an apparatus. These improvements are, however, adapted and desirable for use in other relations.

The main objects of this invention are:

First, to provide in a heating apparatus employing a burner an improved control means whereby the opening and closing of the main valve is controlled through a switch.

Second, to provide an apparatus of this 4 character employing a pilot in which the valve opening means are rendered inoperative in the event the pilot is extinguished while the main burner is not in operation, and one which does not afi'ect the operation of the apparatus in the event the pilot should become extinguished while the burner is burning.

-Third, to provide an apparatus of this character in which a thermally controlled switch is employed, the thermal device being arranged so that it is fully accessible at all times without disassembling the general structure.

Objects pertaining 'to details and economies of our invention will definitely appear fromthe description to follow. The invention is defined in the claims.

-A structure which embodies the features of our invention is clearly illustrated in the accompanying drawings, in which:

Fig. 1 is a fragmentary side elevation of a heating apparatus embodying the features of our invention. Fig. 2 is a fragmentary view mainly in vertical section on line 22 of Fig. 1.

device.

Fig. 4 is a fragmentary section through the cut-out switch device, mainly in section on line 4-4 of Figs. 1, 3, 5 and 6.

Fig. 5 is a detail view mainly in vertical section on line 5-5 of Figs. 2, 3, 4 and 6.

Fig. 6 is a detail section on line 6--6 of Figs. 4 and 5. I

Fig. 7 is a detail section on line 7-7 of Figs. 4 and 5.

Fig. 8 is a diagrammatic view illustrating the relation of the cut-out switch to the motor and main switch.

In the embodiment of our invention illustrated, we provide a base member 1 provided with a plurality of flue openings 2 in its top wall 3., The burner box 4 is mounted on the under side of this base member 1 and coacts therewith to provide a closed combustion chamber 5. This combustion chamber has an air inlet 6.

The burner designated generally-by the numeral 7 is arranged Within the combustion chamber. Pilot burners 8 are provided for the main burner;

The flue header 9.ismounted in spaced relation to the base member l, a plurality of flues .10, preferably of relatively thin copper tubing, being arranged through the bottom 11 of the header with their lower ends projecting into the flue openings 2 of the base member. The valve for the main burner is indicated at 12.

We provide a blower for supplying air under pressure to the main burner and discharging air across the flues 10 which constitute a radiating unit substantially as described in our above mentioned application for patent. The fan 13 of this blower is mounted on the forward end of the shaft 14 of the motor 15. f

On the rear end of the shaft is a governor mechanism indicated generally by the numeral 16. This mechanism is operatively connected to the valve 12 by a lever 17 so I described in a concu nt a l' to th Fig. 3 is a plan view of the cut-out switch I we pp ma 1 e mechanism being preferably that described in such application.

A control or starting switch l8 is provided for the motor as illustrated in the diagrammatic view in Fig. 8-. -As serious results might follow in the event of the main valve being opened when the pilots are extinthis switch to remain closed.

Howeverfin the event of the cooling of this thermal device as would occur on the extinguishment of both the main burner and the pilot, the thermal device opens this switch and the switch cannot be closed until the thermal device is reheated as by the relighting of the pilot.

The thermal device is operatively associated with the radiating fine 20 which is located above one of the pilots 8 so that the heat from the pilot e'fi'ectively acts upon the thermal device. This thermal switch comprises a base member 21 having an insulating block 22 mounted thereon carrying a pair of contacts 23. The movable switch member 24 in.the form of an insulating block carries coacting contacts 25. The wires 26 leading from the switch 18 to the motor are connected to the contacts 23. The contacts 25 are electrically connected by the strip 27.

Springs 28 arranged on the upper ends of the bolts 29 which are passed through the base member 21 urge the movable switch member 24 to switch closing position. A

.cap 30 is provided for the switch members.

A tubular thermal element 31 is threaded into the base member 21 and is adapted to depend into the flue 20, it being arranged through the header as clearly shown in Fig. 2. A second rod-like thermal element 32 is secured at its lower end to a plug 33 threaded into the tube, the upper end of the rod projecting through the switch block 22 to engage a thrust member 34 on the upper switch member. This thrust member is in the form of a screw and is provided with a lock nut 35 so that it may be secured in its adjusted positions.

With the parts thusarranged, when the thermal device is unheated, the contraction of the element 31 lifts the switch member 24 against the tension of the springs 28 and thereby opens the cut-out switch. However, when the pilot is burning there is suflicient heat generated thereby to cause the thermal element 31 to expand, thereby retracting the element 32 and allowing the springs 28 to close the switch. The cut-out switch rema ns open as long as either the pilot or main burner is burning. The cut-out switch mechanism is arranged so that its electrical connections are not exposed to excessive heat.

The device is fully accessible at all times, 1s positive in operation and simple in structure. lVe have illustrated and described our improvements as embodied in a heating apparatus such as illustrated and described in detail in our said application for Letters Patent Serial No. 314,017. WVe have not attempted to illustrate or describe other embodiments or adaptations as we believe this disclosure will enable those skilled in the art to embody or adapt our improvements as may be desired.

Having thus described our invention what we claim'as new and desire to secure by Letters Patent is:

1. In a heating apparatus, the combination of a closed combustion chamber provided with an air inlet, a fine header, radiating flues opening to said combustion chamber and fine header, a main burner within said combustion chamber, a pilot disposed in said combustion chamber in operative relation to said burner and positioned below one of said flues, a blower arranged to deliver air to said air inlet of said combustion cham ber and provided with a motor, a main gas supply valve, a valve controlling mechanism including said motor, a cut-out switch for said motor including a relatively fixed switch member mounted on said header and provided with a pair of contacts, a movable switch member provided with coacting contacts, a spring acting to urge said movable switch member to switch closing position, a tubular thermal element mounted on said fixed switch member and depending into said flue above said pilot, a rod arranged within said tube and connected thereto at its lower end with its upper end in engagement with said movable switch member, and an adjustable thrust member on said movable switch member coacting with the end of said rod.

2. In a heating apparatus, the combina-- tion of a closed combustion chamber provided with an air inlet, a flue header, radiating flues opening to said combustion chamber and fine header, a main burner within said combustion chamber, a pilot disposed in said combustion chamber in operative relation to said burner and positioned below one of said flues, a blower arranged to deliver air to said air inlet of said combustion chamber and provided with a motor, a main gas supply valve, a valve controlling mechanism including said motor, a cut-out switch tion of a closed combustion chamber provided with an air. inlet, a fine header, radiating flues opening to said combustion chamher and flue header, a main burner within said combustion chamber, a pilot disposed in said combustion chamber in operative relation to said burner and positioned below one of said flues, a blower arranged to deliver air to said air inlet of said combustion chamber and provided with a motor, a main gas supply valve, a valve controlling mechanism including said motor, means for controlling said switch including a tubular thermal element arrangedthrough said header and depending into said flue above said pilot, a coacting thermal element arranged within said tubular element and engaging one of the switch members, such switch member being provided with an adjustable thrust member for said rod, and a spring acting to urge said switch member to closed position.

4. In a heating apparatus, the combination of a closed combustion chamber provided with an air inlet, a flue header, radiating fines opening to said combustionv chamher and flue header, a main burner within said combustion chamber, a pilot disposed in said combustion chamber in operative relation to said burner and positioned below one of said flues, a blower arranged to deliver air to said air inlet of said combustion chamher and provided with a motor, a main gas supply valve, a valve controlling mechanism including said motor, means for controlling said switch including a tubular thermal element arranged through said header and depending into said flue above said pilot, and a coacting thermal element arranged within said tubular element and engaging one of the switch members.

5. In a heating apparatus, the combination of a combustion chamber, a flue header, radiating tlues opening to said combustion chamber and flue header, a main burner within said combustion chamber, a pilot disposed in said combustion chamber in operative relation to said burner and adjacent the lower end of one of said flues, and a control mechanism for said heating apparatus including a switch, a spring acting to close said switch, a tubular thermal element disposed in said flue associated with said pilot and a second thermal element operatively associated with said switch arranged within said tube and operatively connected thereto.

6. In a heating apparatus, the combination tion to the switch whereby heat from the main. burner and the pilot actingupon the thermal device permits the closing of the switch.

7. In a heating apparatus, the combina-' tion of a radiating unit comprising a plurality of flues, a main burner operatively associated with said radiating unit, a pilot operatively associated with said radiating unit and with one of said flues to heat a thermal element disposed therein, a thermal element disposed in said flue, a control valve for said main burner, means for delivering a blast of air to said radiating unit including a motor, a valve control mechanism operatively associated with said motor and acting to open the valve when the motor is running, and a cut-out switch for said motor operatively associated with said thermal element.

8. In a heating apparatus, the combination of a closed combustion chamber, a flue header, radiating flues opening to said combustion chamber and flue header, a main burner within said combustion chamber, a pilot disposed in said combustion chamber'in operative relation to said burner and positioned below one of said fines, and control means for said burner including a tubular thermal element arranged through said headerand depending into said flue above said p'i'lot' -and a coacting thermal element arranged within said tubular element.

9. In a heating apparatus, the combination of a combustion chamber, radiating flues opening to said combustion chamber, a main burner within said combustion chamher, a pilot disposed in said combustion chamber in operative relation to said burner and adjacent the lower end of one of said fiues, and a control mechanism for said heating apparatus including a thermal element disposed in said flue associated with said pilot.

10. In a heatin apparatus, the combination with a radiatlng unit comprising a flue, a main burner operatively associated with said radiating unit, a pilot for said main burner disposed below said flue, a main gas supply valve, a blower operatively associated with said radiating unit and provided with a motor, a cut-out switch for said motor, a spring acting to close said switch, and a thermal device acting when unheated to hold said switch in open position disposed in said flue.

11. In a heating apparatus, the combination with a radiating unit comprising a flue, a main burner operatively associated with said radiating unit, a pilot for said main burner disposed 'below said flue, a main gas supply valve, a blower operatively associated with said radiating unit and provided with a motor, a cut-outswitch for said motor, and a thermal device operatively associated with said switch disposed in said flue.

tion of a radiating unit comprising a plurality of fines, a main burner operatlvely associated with said radiating unit, a pilot operatively associated withs'aidburner and with one of said fiues to heat a thermal element disposed therein, and a control mechanism for said'burner including a thermal element disposed in said flue.

13. In a heating apparatus, the combina tion with a radiating unit, a main burner operatively associated with said radiating unit, a pilot for said main burner, a main gas supply valve, a blower operatively associated with said radiating unit and provided with a motor, a cut-out switch for said motor, a spring acting to close said switch,

and a thermal device operatively associated with said pilot acting when unheated to hold said switch in open position.

In witness whereof we have hereunto set our hands.

HUBERT R. HUMPHREY. GEORGE A. HUMPHREY.

12. In a heating apparatus, the comhina-, 

